Here's why:
* Current Discoveries: Astronomers have discovered thousands of exoplanets (planets outside our solar system), but the vast majority of these are orbiting other stars.
* Our Solar System: Our solar system is well-studied, and we have a good understanding of its composition. We know the planets in our solar system, and there's no evidence to suggest the existence of thousands of small planets hiding within.
* Stability: A system with thousands of small planets would be highly unstable. Gravitational interactions would likely lead to collisions and ejections, preventing such a system from existing for long periods.
It's possible that we haven't discovered all the small objects in our solar system, including potential dwarf planets or asteroid-sized bodies. But the idea of thousands of small planets orbiting our Sun is not supported by current scientific understanding.
